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BrainWave: A Matlab Toolbox for Beamformer Source Analysis of MEG Data
2018
Frontiers in Neuroscience
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two different types of source reconstruction implemented in the BrainWave toolbox: (1) event-related beamforming of averaged brain responses and (2) beamformer analysis of modulation of rhythmic brain ...
This article provides an overview of the main features of BrainWave with a step-by-step demonstration of how to proceed from raw experimental data to group source images and time series analyses. ...
Thresholding Using Permutation Tests To statistically threshold source images, BrainWave includes a simple non-parametric permutation test (Nichols and Holmes, 2002; Chau et al., 2004; Lin et al., 2006 ...
doi:10.3389/fnins.2018.00587
pmid:30186107
pmcid:PMC6113377
fatcat:3v4p6oa55vberb7adt7epvlusi
Oscillatory neuronal dynamics associated with manual acupuncture: a magnetoencephalography study using beamforming analysis
2012
Frontiers in Human Neuroscience
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Magnetoencephalography (MEG) enables non-invasive recording of neuronal activity, with reconstruction methods providing estimates of underlying brain source locations and oscillatory dynamics from externally ...
In a beamformer analysis, a two-minute period of manual acupuncture needle manipulation delivered to the ipsilateral right LI-4 (Hegu) acupoint was contrasted with a two-minute baseline period. ...
We thank Dr Mark Lythgoe, UCL Institute of Child Health, University College London, for his helpful advice and suggestions. ...
doi:10.3389/fnhum.2012.00303
pmid:23248594
pmcid:PMC3522113
fatcat:he2btj64mzeebnssa6b32wxp3i
Spatiotemporal oscillatory dynamics during the encoding and maintenance phases of a visual working memory task
2015
Cortex
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In this study, we examined the oscillatory dynamics that serve visual working memory operations using high-density magnetoencephalography (MEG) and advanced time-frequency and beamforming methodology. ...
found that theta (4-7 Hz) activity in the frontal cortices parametrically increased as a function of memory load during the memory maintenance ...
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. ...
doi:10.1016/j.cortex.2015.04.022
pmid:26043156
pmcid:PMC4522359
fatcat:45ljb5nxdrab5hrbvzevi4tevy
Quiet connections: Reduced fronto-temporal connectivity in nondemented Parkinson's Disease during working memory encoding
2016
Human Brain Mapping
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All data were transformed into the time-frequency domain and significant oscillatory activity was imaged using a beamforming approach. ...
Each participant completed a high-load, Sternberg-type working memory task during magnetoencephalography (MEG), and we focused on the encoding and maintenance phases. ...
The Center for Magnetoencephalography at the University of Nebraska Medical Center was founded by the generosity of an anonymous donor. ...
doi:10.1002/hbm.23237
pmid:27151624
pmcid:PMC4980162
fatcat:dwl6xiw4mbeu5gzatm6dsodiza
Identifying true cortical interactions in MEG using the nulling beamformer
2010
NeuroImage
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We estimate interaction measures from the output of the modified beamformer and test for statistical significance using permutation tests. ...
of our nulling beamforming method. ...
Acknowledgments This work was supported by National Institute of Biomedical Imaging and BioEngineering under Grants No R01-EB002010 and No R01-EB000473. ...
doi:10.1016/j.neuroimage.2009.10.078
pmid:19896541
pmcid:PMC2818446
fatcat:p2iyrzulbjelffkeqk4o6pdhba
Circadian modulation of motor-related beta oscillatory responses
2014
NeuroImage
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All MEG data were corrected for head motion and examined in the time-frequency domain using beamforming methods. ...
Finally, beta levels during the baseline period also increased from 09:00 to 16:00 in most regions of the cortical sensorimotor network. ...
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. ...
doi:10.1016/j.neuroimage.2014.08.013
pmid:25128712
pmcid:PMC4252760
fatcat:mc76x4lfkbf7veyrkxowsykete
Population-level inferences for distributed MEG source localization under multiple constraints: Application to face-evoked fields
2007
NeuroImage
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We compared the face validity of subject-specific forward models and their summary statistics in terms of how estimated responses reproduced over subjects. ...
We used these to compare different summary statistics, namely; (i) whether to test for differences between condition-specific source estimates, or whether to test the source estimate of differences between ...
Nonetheless, we repeated the group analyses using non-parametric permutation tests, as implemented in SnPM (Nichols and Holmes, 2002) , with a threshold corrected for multiple comparisons using family-wise ...
doi:10.1016/j.neuroimage.2007.07.026
pmid:17888687
fatcat:zl4nioeoxrey7comjgx7qgbyd4
Aberrant Neuronal Dynamics during Working Memory Operations in the Aging HIV-Infected Brain
2017
Scientific Reports
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Significant oscillatory neural responses were imaged using a beamforming approach to illuminate the spatiotemporal dynamics of neuronal activity. ...
HIV-infected older adults and a demographically-matched group of uninfected controls performed a verbal working memory task during magnetoencephalography (MEG). ...
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. ...
doi:10.1038/srep41568
pmid:28155864
pmcid:PMC5290733
fatcat:aztvl3efsjexta2n7m56jyfsyq
A direct relationship between oscillatory subthalamic nucleus–cortex coupling and rest tremor in Parkinson's disease
2013
Brain
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Tremor-associated changes in cerebro-muscular coherence were localized by Dynamic Imaging of Coherent Sources. ...
Abbreviations: DBS = deep brain stimulation; ImCoh = imaginary part of coherency; LFP = local field potential; MEG = magnetoencephalography 3660 | Brain 2013: 136; 3659-3670 J. ...
Furthermore, we are very thankful to Medtronic for providing non-magnetic lead extensions. In addition, we thank Mrs. E. Rä disch for assistance with MRI scans. ...
doi:10.1093/brain/awt271
pmid:24154618
fatcat:y6mn22q6ybauljmckgvdcanzg4
A new approach to neuroimaging with magnetoencephalography
2005
Human Brain Mapping
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We discuss the application of beamforming techniques to the field of magnetoencephalography (MEG). ...
What is more, MEG beamformer analysis facilitates the study of these complex interactions within cortical networks that are involved in both sensory-motor and cognitive processes. ...
The effects of non-stationarities in the MEG signals on the estimate of the data covariance matrix, and therefore the beamformer images, have yet to be studied. ...
doi:10.1002/hbm.20102
pmid:15846771
fatcat:xej6cd5manc6va2tkujqi4s64y
Abnormal MEG Oscillatory Activity during Visual Processing in the Prefrontal Cortices and Frontal Eye-Fields of the Aging HIV Brain
2013
PLoS ONE
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All MEG data was imaged in the time-frequency domain using beamforming. ...
Despite a large body of neuroscience and imaging studies, the pathophysiology of these HIV-associated neurocognitive disorders (HAND) remains unresolved. ...
Briefly, statistical parametric maps were thresholded at (p,0.01) to define clusters of potentially significant activation. ...
doi:10.1371/journal.pone.0066241
pmid:23840428
pmcid:PMC3688779
fatcat:l2hkqqiplfhizdcfncaezxttv4
Concordance between the Wada test and neuroimaging lateralization: Influence of imaging modality (fMRI and MEG) and patient experience
2018
Epilepsy & Behavior
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Concordance rates (N=16) were non-significant (Cohen's Kappa) between fMRI and Wada test (memory) and between MEG and Wada test (memory and language). ...
Sixteen (84%) patients who were scanned reported some level of obtundation in MEG. ...
We are very grateful to the 19 patients that gave us 1 full-day of their time to undergo further brain scans. ...
doi:10.1016/j.yebeh.2017.09.027
pmid:29245083
fatcat:fpv6pazntjfg3psotycf55incq
Friends, not foes: Magnetoencephalography as a tool to uncover brain dynamics during transcranial alternating current stimulation
2015
NeuroImage
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By means of application of beamforming to magnetoencephalography (MEG) data, we successfully recovered modulations of the amplitude of brain oscillations during weak and strong tACS. ...
Future tACS experiments will be able to deliver direct physiological insights in order to further the understanding of the contribution of brain oscillations to cognition and behavior. ...
T.N. was further supported by a stipend of the Lienert Stiftung. ...
doi:10.1016/j.neuroimage.2015.06.026
pmid:26080310
pmcid:PMC4686537
fatcat:lcox2f2pxzhfhgwshewqczbz4y
Presence of strong harmonics during visual entrainment: A magnetoencephalography study
2012
Biological Psychology
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We utilized magnetoencephalography (MEG) to examine synchronization at harmonics of the visual stimulation frequency (18 Hz). ...
MEG data were analyzed for eventrelated-synchronization (ERS) at the fundamental frequency, 36, 54, and 72 Hz. We found strong ERS in all bands. ...
Rojas and Eugene Kronberg at the University of Colorado Denver School of Medicine. ...
doi:10.1016/j.biopsycho.2012.04.008
pmid:22569101
pmcid:PMC3407313
fatcat:l6draalwlfh5fkci627ahvi5eu
Aberrant high-frequency desynchronization of cerebellar cortices in early-onset psychosis
2009
Psychiatry Research : Neuroimaging
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task effects using statistical parametric mapping. ...
MEG data were imaged in the frequencydomain, using spatial filtering, and the resulting event-related synchronizations and desynchronizations (ERS/ERD) were subjected to voxel-wise analyses of group and ...
Acknowledgments This work was supported by grants from the National Institute of Mental Health (R01 MH63442-02), and the Developmental Psychobiology Research Group (DPRG) of the University of Colorado ...
doi:10.1016/j.pscychresns.2009.03.009
pmid:19783411
pmcid:PMC2760661
fatcat:nrijluoazvbedf7f5yecyzcqum
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